Evidence for triplet superconductivity in Josephson junctions with barriers of the ferromagnetic Heusler alloy Cu2MnAl
D. Sprungmann, K. Westerholt, H. Zabel, M. Weides, H. Kohlstedt
DOI 10.1103/PhysRevB.82.060505 · Physical Review B
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Abstract
We have studied Josephson junctions with barriers prepared from the Heusler compound Cu2MnAl. In the as-prepared state the Cu2MnAl layers are nonferromagnetic and the critical Josephson current density jc decreases exponentially with the thickness of the Heusler layers dF. On annealing the junctions at 240 °C the Heusler layers develop ferromagnetic order and we observe a dependence jc(dF) with jc strongly enhanced and weakly thickness dependent in the thickness range 7.0<dF<10.6 nm. We interpret this feature as an indication of a triplet component in the superconducting pairing function generated by the specific magnetization profile inside thin Cu2MnAl layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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